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SP337EEY-L Datasheet, PDF (9/18 Pages) Exar Corporation – 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER | |||
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SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 4. RS-485 DRIVER OUTPUT SHORT CIRCUIT TEST
EN = 0 or Vcc
A
DI = 0 or Vcc
D
B
IOS D
-7V to +12V V
FIGURE 5. RS-485 DRIVER PROPAGATION DELAY TEST CIRCUIT
A
DI Tx
VOD
B
3.3V
RL
CL
54Ω 50pF
FIGURE 6. RS-485 DRIVER TIMING DIAGRAM
Vcc
DI
0V
B
A
VDIFF
VA â VB
VO+
0V
VOâ
Vcc/2
VO 1/2VO
tPLH
tPHL
Vcc/2
1/2VO
tDPLH
90%
10%
tR
tDPHL
t SKEW = |t DPLH - tDPHL|
90%
10%
tF
9
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